Lesson 3

Question 1

Chemistry of life

Answer 1

Cell
Organelles
Macromolecules
Molecules
atoms

Question 2

Atoms

Answer 2

Protons
Neutrons (except H)
Electrons

Question 3

Element

Answer 3

Substance that cannot be broken down into another substance by chemical means

Question 4

Isotopes

Answer 4

Atoms of the same element that have different numbers of neutrons

Question 5

Covalent bond

Answer 5

Sharing of electron pairs

Question 6

Covalent

Answer 6

Sharing of electron pairs (strong)

Question 7

Ionic

Answer 7

Attraction of opposite charges
(Medium)

Question 8

Hydrogen

Answer 8

Sharing of a h atom
(Weak)

Question 9

Cohesion

Answer 9

Polarity of water promotes the attraction of water molecules for other water molecules
Water is a liquids at most temperature on earth and creates surface tension

Question 10

Adhesion

Answer 10

Polarity of water promotes the attraction of water and other polar molecules

Question 11

pH

Answer 11

Partial hydration
pH=-log[H+]
A higher pH value indicates a lower hydrogen ion concentration

Question 12

Acid

Answer 12

A substance that dissociates in water to increase the [H+]

Question 13

Base

Answer 13

A substance that dissociates in water to decrease [H+]

Question 14

Buffer

Answer 14

A substance that resists change in pH